Currently the lineEndings option does only allow to configure which line endings to expect. There is no single option which works on non-Git based source code (i.e. extracted from a ZIP source archive) accepting both line endings (Windows and Unix).

This is crucial though because by default source archives created with maven-source-plugin are not normalized with respect to line endings, i.e. the archives end up with Windows endings on a Windows machine and Unix endings on all other machines. As the spotless configuration is part of the source archive, building should not fail with spotless errors irrespective of the line ending.